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SPECIALISED CELLS. Modifications of Cell Structure for Specific Functions. Objectives:. 1) Describe how some cells are modified for specific functions: A root hair cell - absorption A xylem vessel – conduction & support A red blood cell – oxygen transport - PowerPoint PPT Presentation
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SPECIALISED CELLS
Modifications of Cell Structure for Specific
Functions
Objectives:1) Describe how some cells are
modified for specific functions: A root hair cell - absorption A xylem vessel – conduction &
support A red blood cell – oxygen transport
2) State the relationship between cell structure and function
Types of Specialized Cells:
1.The Root Hair Cell
2.The Xylem Vessel
3.The Red Blood Cell
The Root Hair Cell
The Root Hair Cell
The Root Hair Cell
Cytoplasm
Water molecules
Long & narrow
Larger vacuole
Do root hairs contain chloroplasts ?
NO!!
Absorption by root hair cell
The Root Hair CellSpecialization of root
hair cellFunction
1. Long and narrow2. Grows outwards
from the roots
Increases surface area to absorb water and minerals
1. Has a very large vacuole
Absorbs as much water as possible
The Xylem Vessel
The Xylem Vessel
Transport of water in xylem
The Xylem Vessel
Specialization of xylem vessel
Function
1. Shape is long, narrow and tube-like
Conducts water and minerals from the roots up to the stems and leaves
1. Has a thick wall of lignin
Provides mechanical strength (support)
The Xylem Vessel
The Red Blood Cell
Colour?Shape?
Red Blood Cell
Specialization of xylem vessel
Function
1. Biconcave disc Its shape gives large surface area to pick up and release oxygen
1. No nucleus Cytoplasm can contain more haemoglobinSo more oxygen can be transported
The Red Blood Cell
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